Submission #1279323

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279323		Bui_Quoc_Cuong	Pinball (JOI14_pinball)	C++20	0 / 100	3 ms	4920 KiB

pinball

#include <bits/stdc++.h>
using namespace std;
const int N = 2e5 + 5;

int n, m;
int a[N], b[N], c[N], d[N];

namespace sub1 {
    long long dp[N][3];
    void solve () {
        vector <int> seg;
        for (int i = 1; i <= n; i++) {
            seg.push_back(i);
        }
        sort(seg.begin(), seg.end(), [&] (int i, int j) {
            return a[i] < a[j];
        });
        memset(dp, 0x3f, sizeof dp);
        for (int i = 0; i < n; i++) {
            if (a[seg[i]] == 1) {
                dp[seg[i]][0] = 0;
            }
            for (int j = 0; j < i; j++) {
                if (seg[j] < seg[i] && c[seg[j]] >= a[seg[i]] && c[seg[j]] <= b[seg[i]]) {
                    dp[seg[i]][0] = min(dp[seg[i]][0], dp[seg[j]][0]);
                }
            }
            dp[seg[i]][0]+= d[seg[i]];
        }   
        reverse(seg.begin(), seg.end());
        for (int i = 0; i < n; i++) {
            if (b[seg[i]] == m) {   
                dp[seg[i]][1] = 0;
            }
            for (int j = 0; j < i; j++) {
                if (seg[j] < seg[i] && c[seg[j]] >= a[seg[i]] && c[seg[j]] <= b[seg[i]]) {
                    dp[seg[i]][1] = min(dp[seg[i]][1], dp[seg[j]][1]);
                }
            }
            dp[seg[i]][1]+= d[seg[i]];
        }   
        long long ans = 1e18;
        for (int i = 1; i <= n; i++) {
            ans = min(ans, dp[i][0] + dp[i][1] - d[i]);
        }
        cout << (ans >= 1e18 ? - 1 : ans);
    }
}

namespace sub2 {        
    long long dp[N][3];

    void solve () { 
        memset(dp, 0x3f, sizeof dp);
        for (int i = 1; i <= n; i++) {
            if (a[i] == 1) dp[i][0] = d[i];
            for (int j = 1; j < i; j++) {
                if (a[i] <= c[j] && c[j] <= b[i]) {
                    dp[i][0] = min(dp[i][0], dp[j][0] + d[i]);
                }
            }
        }   
        for (int i = n; i >= 1; i--) {
            if (b[i] == m) dp[i][1] = d[i];
            for (int j = i + 1; j <= n; j++) {
                if (a[i] <= c[j] && c[j] && b[i]) {
                    dp[i][1] = min(dp[i][1], dp[j][1] + d[i]);
                }
            }
        }
        long long ans = 1e18;
        for (int i = 1; i <= n; i++) {
            ans = max(ans, dp[i][0] + dp[i][1] - d[i]);
        }
        cout << (ans >= 1e18 ? - 1 : ans);
    }   
}

void solve () {
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        cin >> a[i] >> b[i] >> c[i] >> d[i];
    }
    // return sub1 :: solve();
    return sub2 :: solve();
}

signed main () {
    ios_base::sync_with_stdio(0); cin.tie(0);
    #define kieuoanh "joi14_pinball"

    if (fopen(kieuoanh".inp", "r")) {
        freopen(kieuoanh".inp", "r", stdin); freopen(kieuoanh".out", "w", stdout);
    }

    solve();

    return 0;
}

Compilation message (stderr)

pinball.cpp: In function 'int main()':
pinball.cpp:93:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |         freopen(kieuoanh".inp", "r", stdin); freopen(kieuoanh".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
pinball.cpp:93:53: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |         freopen(kieuoanh".inp", "r", stdin); freopen(kieuoanh".out", "w", stdout);
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 18
• Subtask 3: 0 / 22
• Subtask 4: 0 / 49